JP2001523813A - Device for detecting defects in continuously moving plastic strips or tubes using ultrasonic signals and / or measuring their wall thickness - Google Patents
Device for detecting defects in continuously moving plastic strips or tubes using ultrasonic signals and / or measuring their wall thicknessInfo
- Publication number
- JP2001523813A JP2001523813A JP2000521359A JP2000521359A JP2001523813A JP 2001523813 A JP2001523813 A JP 2001523813A JP 2000521359 A JP2000521359 A JP 2000521359A JP 2000521359 A JP2000521359 A JP 2000521359A JP 2001523813 A JP2001523813 A JP 2001523813A
- Authority
- JP
- Japan
- Prior art keywords
- measuring head
- measuring
- tube
- signal
- reflected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000007547 defect Effects 0.000 title claims description 21
- 238000011156 evaluation Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 abstract description 19
- 238000002604 ultrasonography Methods 0.000 description 13
- 238000012937 correction Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 238000001514 detection method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 101001094026 Synechocystis sp. (strain PCC 6803 / Kazusa) Phasin PhaP Proteins 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0235—Plastics; polymers; soft materials, e.g. rubber
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
(57)【要約】 本発明は、超音波信号を用いて、プラスチック製の連続するストリップ、輪郭づけされた形材又は管の中のエラーを検出しかつ／又はその壁厚を測定するための装置に関する。送信機及び受信機の備わった複数の超音波測定用ヘッド（Ａ、Ｂ、Ｃ、Ｄ）が、該ストリップ、輪郭づけされた形材の幅又は管の周囲に沿って分布している。１つの超音波測定用ヘッド（３）の送信機によって発出された信号は、散乱無く反射され、前記超音波測定用ヘッド（３）の受信機によってピックアップされ、一方管、輪郭づけされた形材又はそれと同様のものの上で反射された散乱した信号は、隣接する測定用ヘッド（Ａ、Ｂ）の受信機によってピックアップされる。散乱した反射信号を測定に組込むことによって、直接反射された無散乱信号のみをベースにして行なわれる測定に比べて、各測定のための測定用表面積を著しく増大させることが可能である。 The present invention uses ultrasonic signals to detect errors in continuous strips, contoured profiles or tubes of plastic and / or to measure their wall thickness. Related to the device. A plurality of ultrasonic measuring heads (A, B, C, D) with transmitters and receivers are distributed around the strip, the width of the profiled profile or the circumference of the tube. The signal emitted by the transmitter of one ultrasonic measuring head (3) is reflected without scattering and picked up by the receiver of said ultrasonic measuring head (3), while the tube, the contoured profile Or the scattered signal reflected on the same is picked up by the receiver of the adjacent measuring head (A, B). By incorporating the scattered reflected signal into the measurement, it is possible to significantly increase the measuring surface area for each measurement as compared to a measurement performed based only on the directly reflected unscattered signal.
Description
【０００１】 本発明は、ストリップ、又は形材の幅又は管の周囲全体にわたり分布し、かつ
ストリップ、形材又は管の凸状に湾曲した表面より上に固定された測定用ヘッド
からプラスチック内に垂直に導入される超音波信号を用いて、連続的に移動する
プラスチック製のストリップ、形材又は管の欠陥を検出しかつ／又はそれらの壁
厚を測定するための装置において、反射された超音波信号がそれらによって受信
され評価ユニットに供給される装置に関する。The present invention relates to a method for measuring the width of a strip or a profile or the entire circumference of a tube and into a plastic from a measuring head fixed above the convexly curved surface of the strip or a profile or tube. In a device for detecting defects in continuously moving plastic strips, profiles or tubes and / or measuring their wall thickness using vertically introduced ultrasonic signals, the reflected ultrasonic It relates to a device in which acoustic signals are received and supplied to an evaluation unit.
【０００２】 円筒形管のための規定された（ＵＳ−ＰＳ，４, ７４０, １４６）種類の既知
の装置においては、複数の測定用ヘッドが、管のまわりに比較的大きい間隔どり
を伴って固定された状態で配置されており、かくして管の壁を、管が移動する方
向に延びる数枚のストリップ部においてしかカバーしていない。壁厚測定のため
のこのような装置は、周囲全体にわたる厚みの変化が通常狭い長手方向ストリッ
プ部に制限されず、かなり広い周囲面積に広がっていることから、概して適切な
ものであるかもしれない。しかしながら、厚みの変化が通例から逸脱した場合、
欠陥の無い壁厚測定は可能でない。欠陥は往々にして専ら非常に小さな場所に限
定されていることから、このような装置は基本的に欠陥検出には不適当である。In a known device of the defined (US-PS, 4,740,146) type for cylindrical tubes, a plurality of measuring heads are provided with a relatively large spacing around the tube. It is arranged in a fixed manner, thus covering the wall of the tube only in a few strips extending in the direction of movement of the tube. Such an apparatus for wall thickness measurement may be generally appropriate, as the change in thickness across the perimeter is usually not confined to narrow longitudinal strips but rather extends over a much larger perimeter area. . However, if the change in thickness deviates from the usual,
Defect-free wall thickness measurements are not possible. Such devices are basically unsuitable for defect detection, since defects are often exclusively confined to very small locations.
【０００３】 しかしながら、管の壁は、管の周囲全体にわたって広がる測定用ヘッドを有す
るもう１つの既知の装置（ＤＥ４０３３４４３Ａ１）を用いてその周囲全体にわ
たりチェックすることができる。しかしこのような測定用ヘッドの駆動及び誘導
には、機械のための多大なコストが関与し、かかる測定用ヘッドがらせん経路上
でしか連続移動する管をカバーできないという事実も存在している。従ってこの
場合、カバーされないゾーンも存在する可能性がある。[0003] However, the wall of the tube can be checked over its entire circumference with another known device (DE 40334443 A1) having a measuring head that extends over the entire circumference of the tube. However, the actuation and guidance of such measuring heads involves a great deal of cost for the machine, and there is also the fact that such measuring heads can only cover tubes that move continuously on a helical path. Therefore, in this case, there may be zones that are not covered.
【０００４】 管をその表面全体にわたりカバーできるようにするために、測定用ヘッドが閉
リングを形成しているのが良い。しかしながら、かかる装置がもつ１つの欠点は
、それが多数の測定ヘッドを必要とするということにある。 欠陥及びその方向性を管壁内で検出できるようにするためには、管壁内に超音
波信号を導入し欠陥にて反射された信号を受信するべく、管の外周上に互いに前
後して配置された２つのグループの測定用ヘッドを使用する欠陥検出用の装置が
知られている（ＵＳ ４, ５２３, ４６８）。この目的で、第１のグループは、
管壁内に軸方向に広がる信号を生成し、一方第２のグループは、周囲方向に広が
る超音波信号を生成する。超音波信号を発出する測定用ヘッドの位置、及び反射
された信号を受信する測定用ヘッドの位置、及び伝播速度をも考慮に入れて、管
壁内の欠陥の位置を決定することが可能である。欠陥の位置及び方向性は、一定
数のこのような測定によって決定され得る。受信する測定用ヘッド内で個々の測
定用ヘッドにより発出される超音波信号の混合を防ぐために、測定用ヘッドは多
重化方法によって連続して操作されるので、一定数の受信側測定用ヘッドが超音
波信号を発出する各々の測定用ヘッドと関連付けられる。In order to be able to cover the tube over its entire surface, the measuring head may form a closed ring. However, one disadvantage of such a device is that it requires a large number of measuring heads. In order to be able to detect the defect and its directionality in the tube wall, the ultrasonic signal is introduced into the tube wall and the signals reflected by the defect are received one after the other on the outer circumference of the tube. A device for defect detection using two groups of measuring heads arranged is known (US Pat. No. 4,523,468). For this purpose, the first group:
The second group generates ultrasound signals that extend in the circumferential direction, while the signals generate axially in the tube wall. It is also possible to determine the position of the defect in the tube wall, taking into account also the position of the measuring head emitting the ultrasonic signal, the position of the measuring head receiving the reflected signal, and the propagation speed. is there. The location and orientation of the defect can be determined by a number of such measurements. In order to prevent mixing of the ultrasonic signals emitted by the individual measuring heads in the receiving measuring head, the measuring heads are operated continuously by a multiplexing method, so that a certain number of receiving measuring heads are used. Associated with each measuring head that emits an ultrasonic signal.
【０００５】 管などの壁厚は、１つのグループの測定用ヘッドが排他的に軸方向超音波信号
を伝送し、測定用ヘッドの他のグループが管の周囲方向に排他的に延びそして超
音波信号を発生する、このような装置欠陥方向を用いて決定することができない
ものである。この装置は又、管内の比較的大きな欠陥及びそれらの方向性の決定
しか関与していないので、比較的小さなゾーン内で作動する測定用ヘッドのみを
使用して管をその全体的面積にわたりカバーするという問題点は関与しない。[0005] The wall thickness of a tube or the like is such that one group of measuring heads exclusively transmits axial ultrasound signals, another group of measuring heads extends exclusively in the circumferential direction of the tube and the ultrasound Signals that cannot be determined using such device defect directions are generated. This device also covers only the relatively large defects in the tube and their orientation, so that the tube is covered over its entire area using only measuring heads operating in relatively small zones. Does not matter.
【０００６】 本発明の目的は、凸状に湾曲した表面をもつストリップ、形材又は管の中の壁
厚及び／又は欠陥を完全にカバーするための装置を提供することにある。 この課題は、本発明によると、測定用ヘッドが、ストリップ、形材又は管の壁
を完全にカバーするようにストリップ、形材又は管の上での反射信号の音波伝播
、散乱及び屈折を可能にするべく、ストリップ、形材又は管が移動する方向から
横方向に互いに並んで配置されており、各々の測定用ヘッドの送信機により発出
された信号のうちのストリップ、形材又は管上で反射される信号は前記測定用ヘ
ッドによって及びその各々の側で隣接する測定用ヘッドによって受理され、一方
測定用ヘッドの数は Ｎ≧πＲ／Ｓtan α であり、各測定用ヘッドの受信の直径は、 Ｋ≧２πＲ／ＮＴ であり、超音波信号の波長が、 λ≧Ｒ（１−cos ３６０／ＮＴ） であり、式中、 Ｎ＝測定用ヘッドの数、 Ｒ＝ストリップ、形材又は管の表面の外部曲率半径、 Ｓ＝湾曲した表面からの測定用ヘッドの距離、 α＝測定用ヘッドの超音波送信機の開口角度、 Ｋ＝各測定用ヘッドの受信表面の直径、及び Ｔ＝測定用ヘッドあたりの測定用ゾーンの数、 λ＝超音波信号の波長、 であるという特長によって特定される種類の装置において解決される。It is an object of the present invention to provide an apparatus for completely covering wall thicknesses and / or defects in strips, profiles or tubes with convexly curved surfaces. This object is achieved according to the invention in that the measuring head allows the sound wave propagation, scattering and refraction of the reflected signal over the strip, profile or tube so that the measuring head completely covers the wall of the strip, profile or tube. In order to ensure that the strips, profiles or tubes are arranged side by side in the transverse direction from the direction of travel, and on the strips, profiles or tubes of the signal emitted by the transmitter of the respective measuring head. The reflected signal is received by the measuring heads and on each side by adjacent measuring heads, while the number of measuring heads is N ≧ πR / Stan α, and the receiving diameter of each measuring head is K ≧ 2πR / NT, the wavelength of the ultrasonic signal is λ ≧ R (1-cos 360 / NT), where N = number of measuring heads, R = strip, profile or tube. Outer radius of curvature of the surface, S = Distance of the measuring head from the curved surface, α = opening angle of the ultrasonic transmitter of the measuring head, K = diameter of the receiving surface of each measuring head, and T = number of measuring zones per measuring head , Λ = wavelength of the ultrasonic signal.
【０００７】 超音波パルスエコー方法によって作動する測定用ヘッドを用いた従来の欠陥検
出及び／又は壁厚測定用装置においては、測定用ヘッドの受信機は、前記測定用
ヘッドの送信機によって発出され反射された信号を排他的に受信し、湾曲した表
面にて屈折させられた、つまりは測定から見失われた信号は受信しないが、本発
明に従うと、発出され屈折した超音波信号のうちのこれらの「喪失した」部分さ
えも測定のために利用され、これらの信号は隣接する測定ヘッドのセンサーによ
って受信される。こうして測定されるべき物体の全表面を数個の超音波測定用ヘ
ッドを用いて完全にカバーすることが可能となる。超音波測定用ヘッドによって
発出された信号は結果としてより大きい面積にわたり通過することから、従来の
装置の場合に比べ、必要とされる測定用ヘッドの数は少なくてすむ。In a conventional device for defect detection and / or wall thickness measurement using a measuring head operated by the ultrasonic pulse echo method, the receiver of the measuring head is emitted by the transmitter of the measuring head. Exclusively receives the reflected signal and does not receive the signal refracted at the curved surface, i.e. missing from the measurement, but according to the invention, these of the emitted and refracted ultrasonic signals Even the "lost" part of the is utilized for measurement, and these signals are received by the sensors of the adjacent measuring head. In this way it is possible to completely cover the entire surface of the object to be measured with several ultrasonic measuring heads. Since the signal emitted by the ultrasonic measuring head passes over a larger area as a result, fewer measuring heads are required than in the case of conventional devices.
【０００８】 測定用ヘッドの設計用の本発明に従ったルールが遵守されたならば、超音波測
定用ヘッドから発出されテストされるべき管又はストリップ上で反射された超音
波信号について、隣接する測定用ヘッドの音圧に関する入れ子式のベル形曲線が
得られる。測定用ヘッドの設計に起因して、前記ベル形曲線はエコー信号の評価
のための音圧がベル形曲線の交差点に至るまでなお適切であり続ける程度まで互
いの中に入れ子式になっていなければならない。測定用ヘッドあたりの測定ゾー
ンの数を決定するに際しては、２つの隣接する測定用ヘッドの間で同じ測定ゾー
ンがまず最初に、１つの測定用ヘッドにより発出されもう１つの隣接する測定用
ヘッドにより受信された反射済み信号によってカバーされ、その後別の測定用ヘ
ッドから送信され隣接する測定用ヘッドにより受信された反射済み信号によって
カバーされることから、測定ゾーンが部分的に「鏡映される」ということを念頭
においておかなければならない。このような「鏡映された」測定ゾーン、すなわ
ち２回カバーされたゾーンは、一回のみ計数される。[0008] If the rules according to the invention for the design of the measuring head are adhered to, the neighboring ultrasonic signals emitted from the ultrasonic measuring head and reflected on the tube or strip to be tested are considered. A nested bell-shaped curve for the sound pressure of the measuring head is obtained. Due to the design of the measuring head, the bell-shaped curves must be nested within each other to such an extent that the sound pressure for the evaluation of the echo signal remains still appropriate until the intersection of the bell-shaped curves. Must. In determining the number of measuring zones per measuring head, the same measuring zone is firstly emitted between two adjacent measuring heads by one measuring head and by another adjacent measuring head. The measurement zone is partially "mirrored" because it is covered by the received reflected signal and then covered by the reflected signal transmitted from another measuring head and received by an adjacent measuring head. You have to keep that in mind. Such a "mirrored" measurement zone, ie a zone covered twice, is counted only once.
【０００９】 屈折されない反射済み信号及び屈折させられた反射済み信号を考慮に入れて、
いかなる重複もなく表面をカバーすることは基本的に可能である。この場合、測
定される単位面積あたり最少数の測定用ヘッドで充分である。しかしながら、各
部分が、屈折の無い反射済み信号を用いるだけでなく、屈折した反射済み信号を
使用して調査されるように、重複が発生することについての対策を講じることは
できない。後者の場合には、その異なる入射角度に起因して、屈折した信号は、
屈折されていない信号によって検出するのが困難な欠陥を検出し得るという利点
がある。[0009] Taking into account the unreflected reflected signal and the refracted reflected signal,
It is basically possible to cover the surface without any overlap. In this case, the minimum number of measuring heads per unit area to be measured is sufficient. However, no provision can be made for the occurrence of duplication, as each part uses not only the reflected signal without refraction but also the probe using the refracted reflected signal. In the latter case, due to the different angles of incidence, the refracted signal is:
There is the advantage that defects that are difficult to detect by the signal that has not been refracted can be detected.
【００１０】 信号の処理を容易にするため、評価ユニットに対して平行に全ての信号が供給
されるわけではなく、測定用ヘッドが周期的に動作するようにすることも可能で
ある。しかしながら一定数のサイクルが並行してランすることは可能である。 ここで本発明について、その一実施形態を例示する図面を参考にしながらより
詳細に説明する。超音波信号の線の全体の経路を図面中に物理的かつ実際的に表
示することができないことから、この提示は単に１つのモデルでしかあり得ない
ことに留意されたい。To facilitate signal processing, not all signals are supplied in parallel to the evaluation unit, but it is also possible for the measuring head to operate periodically. However, it is possible for a certain number of cycles to run in parallel. Here, the present invention will be described in more detail with reference to the drawings illustrating one embodiment thereof. Note that this presentation can only be one model, since the entire path of the ultrasound signal line cannot be physically and practically represented in the drawing.
【００１１】 本発明は、一方では、例えば管といったような測定すべき物体に対し特定の幾
何的関係で配置されている測定用ヘッド、そして他方では操作及び評価用ユニッ
トを含んで成る。操作・評価用ユニットは、図面には示されていない。操作用ユ
ニットは測定用ヘッドを周期的に操作するので、１つの測定用ヘッドが反射済み
信号を発出し受信し、隣接する２つの測定用ヘッドが受信のみする。評価ユニッ
トは、測定用ヘッドの幾何学的配置、より特定的には信号のエッジにおける音圧
の自然な降下を考慮して、反射済みの受信信号を評価する。特殊な種類の評価は
、本発明の一部を成すものではない。The invention comprises, on the one hand, a measuring head which is arranged in a specific geometric relation to the object to be measured, for example a tube, and on the other hand an operating and evaluating unit. The operation and evaluation unit is not shown in the drawing. Since the operating unit periodically operates the measuring head, one measuring head emits and receives a reflected signal, and two adjacent measuring heads only receive. The evaluation unit evaluates the reflected received signal taking into account the geometry of the measuring head, more particularly the natural drop in sound pressure at the edges of the signal. A special kind of evaluation does not form part of the present invention.
【００１２】 図面は、未散乱、反射済み超音波信号及び散乱し、反射済みの超音波信号を考
慮に入れて、互いに並んで配置された測定用ヘッドを用いた管壁の完全なカバー
の幾何学的関係を示している。「未散乱」という語は、測定用ヘッドによって発
出された信号がこの測定用ヘッドによって同様に受信されうるように屈折を伴う
反射のことを意味し、一方、「散乱した」という語は、測定用ヘッドにより発出
された信号がこの測定用ヘッドによって受信され得ずその両側に配置された測定
用ヘッドによってのみ受信され得るような、屈折を伴う反射を意味する。The drawings show the complete cover geometry of the tube wall with the measuring heads arranged side by side, taking into account the unscattered, reflected ultrasound signals and the scattered, reflected ultrasound signals. Shows a scientific relationship. The term "unscattered" refers to a reflection with refraction such that the signal emitted by the measuring head can also be received by the measuring head, while the term "scattered" Means a reflection with refraction such that the signal emitted by the measuring head cannot be received by this measuring head but can only be received by measuring heads located on both sides thereof.
【００１３】 一定数の超音波測定用ヘッドＡ、Ｂ、Ｃ、Ｄ、が円筒形管１（半分のみ図示）
のまわりに円形で外向きに離れた状態で置かれている。超音波測定用ヘッドＡ、
Ｂ、Ｃ、Ｄは、管１において垂直に方向づけされ、管の表面から距離Ｓのところ
に配置されている。各々の超音波測定用ヘッドＡ、Ｂ、Ｃ、Ｄは、単純さを期し
て図面に示されているように、円錐形に開口角度無しではなく外へ広がる超音波
信号を発出する。直径ＫS の受信表面が、超音波信号の入口及び後方壁のエコー
を受信するのに利用可能である。A fixed number of ultrasonic measurement heads A, B, C, and D are cylindrical tubes 1 (only half is shown).
It is placed in a circular shape and is spaced outwardly. Ultrasonic measurement head A,
B, C and D are oriented vertically in the tube 1 and are located at a distance S from the surface of the tube. Each of the ultrasonic measuring heads A, B, C, D emits an ultrasonic signal that extends outward rather than conically without an opening angle, as shown in the drawing for simplicity. A receiving surface of diameter K S is available to receive the ultrasound signal entrance and back wall echoes.
【００１４】 超音波測定用ヘッドＡ、Ｂ、Ｃ、Ｄは周期的に動作する。超音波測定用ヘッド
Ｂが超音波信号を送信すべく操作された場合、発出された信号のうちの一部分の
み、すなわち、未散乱反射済み部分がその受信機によって受信される。信号のこ
の部分は図１に斜線入りで示されている。従って、管の内壁１のゾーンｂのみが
、測定用ヘッドＢによって直接カバーされる。残りは管１上で散乱させられ、側
面に反射される。隣接する測定用ヘッドＡ、Ｃの受信機は、これらの散乱した反
射済み信号の一部分を受信する。信号のこれらの成分は、図２に斜線入りで示さ
れている。これらの信号は、管の内壁上でゾーンａ及びｃに対応する。図２が示
すとおり、カバーされていないゾーンは、一方ではａとｂの間に、又他方ではｂ
とｃの間に残される。しかしながら、これらのカバーされていないゾーンは、超
音波信号の送信中、測定用ヘッドＣによりカバーされる。The ultrasonic measurement heads A, B, C, and D operate periodically. When the ultrasonic measurement head B is operated to transmit an ultrasonic signal, only a part of the emitted signal, that is, an unscattered reflected part is received by the receiver. This part of the signal is shown hatched in FIG. Thus, only the zone b of the inner wall 1 of the tube is directly covered by the measuring head B. The rest is scattered on the tube 1 and reflected on the sides. The receivers of adjacent measuring heads A, C receive a portion of these scattered reflected signals. These components of the signal are shown hatched in FIG. These signals correspond to zones a and c on the inner wall of the tube. As FIG. 2 shows, the uncovered zone is on the one hand between a and b and on the other hand b
And c. However, these uncovered zones are covered by the measuring head C during transmission of the ultrasound signal.
【００１５】 図３が示すように、管の内部壁上のゾーンｂ’は、超音波測定用ヘッドＣの送
信機によって発出された未散乱反射済み信号によってカバーされる。 図４が示すように、超音波測定用ヘッドＣの送信機によって発出された超音波
信号の散乱した反射済み信号は、管内壁上のゾーンａ’、ｃ’をカバーする。従
って、ゾーンａ’は、超音波測定用ヘッドＢの送信機によって発出された信号に
よってカバーされなかったゾーンｂとｃの間の間隙をカバーする。As FIG. 3 shows, the zone b ′ on the inner wall of the tube is covered by the unscattered reflected signal emitted by the transmitter of the ultrasonic measuring head C. As FIG. 4 shows, the scattered reflected signal of the ultrasonic signal emitted by the transmitter of the ultrasonic measuring head C covers the zones a ′, c ′ on the inner wall of the tube. Thus, zone a 'covers the gap between zones b and c that was not covered by the signal emitted by the transmitter of the ultrasonic measuring head B.
【００１６】 従って、本発明に従った装置を用いると、超音波信号の送信のため比較的少数
の測定用ヘッドＡ、Ｂ、Ｃ、Ｄを用い、測定すべき物体の湾曲した表面上で反射
され側方へ外れた超音波信号をも使用し、管を完全にカバーすることが可能であ
る。少数の測定用ヘッドにより、長手方向にも測定すべき物体を完全にカバーで
きるように、高い周波数の測定シーケンスで周期的に操作を実施することが可能
となる。確かに、できるかぎり少ない超音波測定用ヘッドでやりくりするため、
散乱を伴って及び散乱無しで反射された超音波信号のいかなる重複もなく測定を
実施することが可能であるが、測定すべき物体の壁は、散乱無く反射された超音
波信号及び散乱により反射された超音波信号の両方によっても調査され得る。後
者の場合、屈折した超音波信号の異なる入射角に起因して、そうでなければ検出
の困難な欠陥も検出することができるという付加的な効果もある。Thus, with the device according to the invention, a relatively small number of measuring heads A, B, C, D are used for the transmission of ultrasound signals and the reflection on the curved surface of the object to be measured It is also possible to completely cover the tube using the ultrasonic signal which is displaced laterally. The small number of measuring heads makes it possible to carry out the operation periodically in a high-frequency measuring sequence, so that the object to be measured can also be completely covered in the longitudinal direction. Indeed, in order to manage with the smallest possible ultrasonic measurement head,
Although it is possible to carry out the measurement without any overlap of the reflected ultrasound signals with and without scattering, the wall of the object to be measured is not reflected by the reflected ultrasound signals and by the scattering. It can also be investigated by both of the ultrasound signals obtained. In the latter case, there is the additional effect that defects which would otherwise be difficult to detect can also be detected due to the different angles of incidence of the refracted ultrasound signal.
【手続補正書】[Procedure amendment]
【提出日】平成１２年６月１日（２０００．６．１）[Submission date] June 1, 2000 (2006.1)
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】特許請求の範囲[Correction target item name] Claims
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【特許請求の範囲】[Claims]
【手続補正２】[Procedure amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００１[Correction target item name] 0001
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【０００１】 本発明は、連続的に移動するプラスチックのストリップ、形材又は管の欠陥を
検出し、及び／又は壁厚を測定する装置に関し、ストリップ、形材又は管の壁を
完全にカバーするため、ストリップ、形材又は管が走る方向の横方向に並んで、
該ストリップ又は形材の幅又は管の周囲にわたり分布し、該ストリップ、形材又
は管の上方に固定された測定ヘッドからプラスチックに垂直に導入される超音波
信号を用い、それらの反射された信号はそれらによって受信され、評価ユニット
に供給される。The present invention relates to a device for detecting defects in a continuously moving plastic strip, profile or tube and / or measuring wall thickness, which completely covers the wall of the strip, profile or tube. Therefore, side by side in the direction in which the strips, sections or tubes run,
Using ultrasonic signals distributed over the width of the strip or profile or around the tube and introduced perpendicularly to the plastic from a measuring head fixed above the strip, profile or tube, their reflected signals Are received by them and supplied to the evaluation unit.
【手続補正３】[Procedure amendment 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００２[Correction target item name] 0002
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【０００２】 明記された種類の既知の装置（ＪＰ−Ａ−６０ ２３５ ０５５）において、
測定ヘッドは多角形の断面の各側と関連している。個々の測定ヘッドは超音波信
号の発出のため連続して作動する。形材の中にそしてそこを通って送信され、反
射された信号は、信号を発出する測定ヘッドを除き、測定ヘッドにより検出され
る。問題の装置が全体の横断面を完全にカバーすることを目的とすると考えたと
しても、この目的を測定ヘッドを用いて全く達成できるかどうかは疑問である。
それは単にその物品の多角形の横断面の個々の側を部分的にカバーしているだけ
である。具体的な情報は、音波の伝播、散乱及び屈折を考慮し、受信された信号
の処理に関する先行技術から集めることができる。 さらに、連続して動くストリップ又は管の欠陥を検出し、及び／又は厚さを測
定する装置において、管又は同様のものの周囲に周期的に操作される複数の測定
ヘッドを分布させることは知られている（ＤＥ−Ａ−２ ２８２ ６４３，ＥＰ
−Ａ−０ ５３８ １１０，ＪＰ−Ａ−５ １２６ ８０３）。 円筒形管のための規定された種類の別の既知の装置（ＵＳ−ＰＳ，４, ７４０
, １４６）においては、複数の測定用ヘッドが管の周囲に比較的大きい間隔どり
を伴って固定された状態で配置されており、管が移動する方向に延びるほんのわ
ずかのストリップで管壁をカバーしている。このような壁厚測定のための装置は
、周囲にわたる厚さの変化が通常狭い長手方向のストリップに限定されず、相当
大きな周囲面積にわたって広がっているので、概して適切であるかも知れない。
しかしながら、厚さの変化が通例から外れているなら、欠陥のない壁厚測定は可
能ではない。欠陥は往々にして専ら非常に小さな場所に限定されていることから
、このような装置は基本的には欠陥検出には不適当である。In a known device of the specified type (JP-A-60 235 055)
A measuring head is associated with each side of the polygonal cross section. The individual measuring heads operate continuously for emitting ultrasonic signals. The reflected signal transmitted into and through the profile is detected by the measuring head, except for the measuring head which emits the signal. Even if one considers that the device in question is aimed at completely covering the entire cross section, it is doubtful whether this object can be achieved at all with the measuring head.
It only partially covers the individual sides of the polygonal cross section of the article. Specific information can be gleaned from the prior art regarding the processing of received signals, taking into account the propagation, scattering and refraction of sound waves. Furthermore, it is known to distribute a plurality of periodically operated measuring heads around a tube or the like in a device for detecting defects and / or measuring the thickness of a continuously moving strip or tube. (DE-A-2 282 643, EP
-A-0 538 110, JP-A-5 126 803). Another known device of a defined type for cylindrical tubes (US-PS, 4,740)
, 146), a plurality of measuring heads are arranged fixedly with relatively large spacing around the tube and cover the tube wall with only a few strips extending in the direction of movement of the tube. are doing. An apparatus for such wall thickness measurement may be generally appropriate because the thickness variation over the periphery is not usually limited to narrow longitudinal strips but rather extends over a significant perimeter area.
However, defect-free wall thickness measurements are not possible if the thickness changes are out of the ordinary. Such devices are basically unsuitable for defect detection, since defects are often exclusively confined to very small locations.
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００６[Correction target item name] 0006
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【０００６】 本発明の目的は、凸状に湾曲した表面をもつストリップ、形材又は管の中の壁
厚及び／又は欠陥を完全にカバーするための装置を提供することにある。 この課題は、本発明によると、音波の伝播、散乱及び反射された信号の屈折を
考慮し、ストリップ、形材又は管の凸状に湾曲した表面上に測定ヘッド（Ａ，Ｂ
，Ｃ，Ｄ）が配置され、各測定ヘッド（Ｂ）の送信機により発出された信号の反
射された信号が上記測定ヘッド（Ｂ）及びその両側に隣接する測定ヘッド（Ａ，
Ｃ）により受信され、隣接する測定ヘッド（Ａ，Ｂ，Ｃ）についての反射された
信号は互いに重なる表面領域（ａ，ｂ，ｃ，ａ′，ｂ′，ｃ′）から出ていると
いう特徴により規定される種類の装置において解決される。本発明の１つの特徴
によると、測定ヘッドの数は、 Ｎ≧πＲ／Ｓtan α であり、各測定用ヘッドの受信の直径は、 Ｋ≧２πＲ／ＮＴ であり、超音波信号の波長が、 λ≧Ｒ（１−cos ３６０／ＮＴ） であり、式中、 Ｎ＝測定用ヘッドの数、 Ｒ＝ストリップ、形材又は管の表面の外部曲率半径、 Ｓ＝湾曲した表面からの測定用ヘッドの距離、 α＝測定用ヘッドの超音波送信機の開口角度、 Ｋ＝各測定用ヘッドの受信表面の直径、及び Ｔ＝測定用ヘッドあたりの測定用ゾーンの数、 λ＝超音波信号の波長、 であるという特長によって特定される種類の装置において解決される。It is an object of the present invention to provide an apparatus for completely covering wall thicknesses and / or defects in strips, profiles or tubes with convexly curved surfaces. The object is to provide a measuring head (A, B) on a convexly curved surface of a strip, section or tube, taking into account the propagation, scattering and refraction of the reflected signal according to the invention.
, C, D) are arranged, and the reflected signal of the signal emitted by the transmitter of each measuring head (B) is combined with the measuring head (B) and the measuring heads (A,
C) and the reflected signals for the adjacent measuring heads (A, B, C) originate from surface areas (a, b, c, a ', b', c ') which overlap one another. In a device of the type defined by According to one feature of the invention, the number of measuring heads is N ≧ πR / Stan α, the receiving diameter of each measuring head is K ≧ 2πR / NT, and the wavelength of the ultrasonic signal is λ ≧ R (1-cos 360 / NT), where N = number of measuring heads, R = external radius of curvature of the surface of the strip, profile or tube, S = measuring head from curved surface Distance, α = aperture angle of ultrasonic transmitter of measuring head, K = diameter of receiving surface of each measuring head, and T = number of measuring zones per measuring head, λ = wavelength of ultrasonic signal, This is solved in a device of the type specified by the feature that
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2F068 AA28 AA48 BB05 BB09 BB24 CC00 FF12 FF14 KK12 KK14 KK17 KK18 PP01 PP05 2G047 AA08 AB01 AB04 AD18 BA03 BC07 BC18 DB17 GA13 GF06──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F068 AA28 AA48 BB05 BB09 BB24 CC00 FF12 FF14 KK12 KK14 KK17 KK18 PP01 PP05 2G047 AA08 AB01 AB04 AD18 BA03 BC07 BC18 DB17 GA13 GF06
Claims (2)
布し、かつストリップ、形材又は管の凸状に湾曲した表面より上に固定された測
定用ヘッド（Ａ、Ｂ、Ｃ、Ｄ）からプラスチック内に垂直に導入される超音波信
号を用いて、連続的に移動するプラスチック製のストリップ、形材又は管の欠陥
を検出しかつ／又はそれらの壁厚を測定するための装置であって、反射された超
音波信号はそれらによって受信され評価ユニットに供給され、測定用ヘッド（Ａ
、Ｂ、Ｃ、Ｄ）は、ストリップ、形材又は管の壁を完全にカバーするようにスト
リップ、形材又は管の上での反射信号の音波伝播、散乱及び屈折を可能にすべく
、ストリップ、形材又は管（１）が移動する方向から横方向に互いに並んで配置
されており、各々の測定用ヘッド（Ｂ）の送信機により発出された信号のうちの
ストリップ、形材又は管上で反射される信号は前記測定用ヘッド（Ｂ）よって及
びその各々の側で隣接する測定用ヘッド（Ａ、Ｃ）によって受信されることを特
徴とする装置。1. A measuring head (A, B) distributed over the width of the strip or profile or around the circumference of the tube (1) and fixed above the convexly curved surface of the strip, profile or tube. , C, D) to detect defects in continuously moving plastic strips, profiles or tubes and / or to measure their wall thickness using ultrasonic signals introduced vertically into the plastic. A reflected ultrasonic signal is received by them and supplied to an evaluation unit, and the measuring head (A
, B, C, D) are strips to allow sound propagation, scattering and refraction of the reflected signal over the strip, profile or tube so as to completely cover the wall of the strip, profile or tube. , The sections or tubes (1) are arranged side by side in the transverse direction from the direction of movement, and on the strips, sections or tubes of the signals emitted by the transmitters of the respective measuring heads (B) The signal reflected at the measuring head (B) is received by the measuring head (B) and on each side thereof by adjacent measuring heads (A, C).
特徴とする、請求項１に記載の装置。2. The device according to claim 1, wherein the measuring heads (A, B, C, D) operate periodically.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19751193 | 1997-11-19 | ||
| DE19751193.7 | 1997-11-19 | ||
| PCT/EP1998/007515 WO1999026040A1 (en) | 1997-11-19 | 1998-11-13 | Device for detecting errors and/or measuring wall thickness in continuous strips or tubes made of plastic using ultrasonic signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001523813A true JP2001523813A (en) | 2001-11-27 |
| JP3477170B2 JP3477170B2 (en) | 2003-12-10 |
Family
ID=7849162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000521359A Expired - Fee Related JP3477170B2 (en) | 1997-11-19 | 1998-11-13 | Apparatus for detecting defects in continuously moving plastic strips or tubes using ultrasonic signals and / or measuring their wall thickness |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6443011B1 (en) |
| EP (1) | EP1032804B1 (en) |
| JP (1) | JP3477170B2 (en) |
| AT (1) | ATE260458T1 (en) |
| DE (2) | DE59810859D1 (en) |
| DK (1) | DK1032804T3 (en) |
| WO (1) | WO1999026040A1 (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9480983B2 (en) | 2011-09-30 | 2016-11-01 | Becton, Dickinson And Company | Unitized reagent strip |
| US9528142B2 (en) | 2001-02-14 | 2016-12-27 | Handylab, Inc. | Heat-reduction methods and systems related to microfluidic devices |
| US9618139B2 (en) | 2007-07-13 | 2017-04-11 | Handylab, Inc. | Integrated heater and magnetic separator |
| USD787087S1 (en) | 2008-07-14 | 2017-05-16 | Handylab, Inc. | Housing |
| US9670528B2 (en) | 2003-07-31 | 2017-06-06 | Handylab, Inc. | Processing particle-containing samples |
| US9677121B2 (en) | 2001-03-28 | 2017-06-13 | Handylab, Inc. | Systems and methods for thermal actuation of microfluidic devices |
| US9765389B2 (en) | 2011-04-15 | 2017-09-19 | Becton, Dickinson And Company | Scanning real-time microfluidic thermocycler and methods for synchronized thermocycling and scanning optical detection |
| US9802199B2 (en) | 2006-03-24 | 2017-10-31 | Handylab, Inc. | Fluorescence detector for microfluidic diagnostic system |
| US9815057B2 (en) | 2006-11-14 | 2017-11-14 | Handylab, Inc. | Microfluidic cartridge and method of making same |
| US10065185B2 (en) | 2007-07-13 | 2018-09-04 | Handylab, Inc. | Microfluidic cartridge |
| US10071376B2 (en) | 2007-07-13 | 2018-09-11 | Handylab, Inc. | Integrated apparatus for performing nucleic acid extraction and diagnostic testing on multiple biological samples |
| US10100302B2 (en) | 2007-07-13 | 2018-10-16 | Handylab, Inc. | Polynucleotide capture materials, and methods of using same |
| US10179910B2 (en) | 2007-07-13 | 2019-01-15 | Handylab, Inc. | Rack for sample tubes and reagent holders |
| US10364456B2 (en) | 2004-05-03 | 2019-07-30 | Handylab, Inc. | Method for processing polynucleotide-containing samples |
| US10571935B2 (en) | 2001-03-28 | 2020-02-25 | Handylab, Inc. | Methods and systems for control of general purpose microfluidic devices |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6920792B2 (en) * | 2003-05-05 | 2005-07-26 | John H. Flora | Transducer guided wave electromagnetic acoustic |
| DE10335747B4 (en) * | 2003-08-05 | 2014-09-04 | Volkswagen Ag | Method for testing the quality of a slush skin |
| DE102006010010A1 (en) * | 2006-03-04 | 2007-09-06 | Intelligendt Systems & Services Gmbh & Co Kg | Method for ultrasonic testing of a workpiece in a curved area of its surface and suitable test arrangement for carrying out the method |
| FR2907901B1 (en) * | 2006-10-31 | 2009-04-24 | Airbus France Sas | NON-DESTRUCTIVE ULTRASONIC CONTROL METHOD AND MEASURING PROBE FOR IMPLEMENTING THE PROCESS |
| DE102006056735A1 (en) * | 2006-12-01 | 2008-06-05 | Inoex Gmbh | Measuring method for determining the wall thickness of an extruded plastic profile |
| US9360309B2 (en) * | 2008-03-14 | 2016-06-07 | Cidra Corporate Services Inc. | Method and apparatus for monitoring of component housing wall thickness and wear monitoring |
| AT512647B1 (en) * | 2012-09-12 | 2013-10-15 | Engel Austria Gmbh | Temperature gradient determination in the melting chamber |
| DE102014214046B3 (en) * | 2014-07-18 | 2015-10-01 | Inoex Gmbh | Measuring device and method for measuring test objects |
| DE102016111044A1 (en) * | 2016-06-16 | 2017-12-21 | INOEX GmbH Innovationen und Ausrüstungen für die Extrusionstechnik | Terahertz measuring device and a terahertz measuring method, for measuring a test object by means of a transit time measurement |
| DE102017125740B4 (en) * | 2017-11-03 | 2021-05-27 | INOEX GmbH Innovationen und Ausrüstungen für die Extrusionstechnik | Terahertz measuring method and terahertz measuring device for measuring pipes |
| DE102017125753A1 (en) * | 2017-11-03 | 2019-05-09 | INOEX GmbH Innovationen und Ausrüstungen für die Extrusionstechnik | Terahertz measuring method and terahertz measuring device for measuring at least one wall thickness of a tubular measuring object |
| CN108016020B (en) * | 2017-12-12 | 2023-10-24 | 河北天昱恒科技有限公司 | Automatic detection device for plastic pipe |
| DE102023130214A1 (en) * | 2023-11-01 | 2025-05-08 | CiTEX Holding GmbH | Ultrasonic measuring device and method for measuring extrusion products, as well as extrusion line |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3778757A (en) * | 1972-09-01 | 1973-12-11 | Gen Electric | Method and apparatus for visual imaging ultrasonic echo signals utilizing multiple transmitters for reduced specular reflection effects |
| FR2298921A5 (en) * | 1973-01-29 | 1976-08-20 | Commissariat Energie Atomique | ULTRASONIC CONTROL PROCESS FOR HIGH THICKNESS WELDING AND IMPLEMENTATION DEVICES |
| DE2806550C2 (en) * | 1978-02-16 | 1982-10-28 | Karl Deutsch Prüf- und Meßgerätebau, 5600 Wuppertal | Device for automatic ultrasonic testing of round material |
| DE2828643A1 (en) * | 1978-06-27 | 1980-01-10 | Mannesmann Ag | METHOD AND DEVICE FOR ULTRASONIC TESTING TUBES AND RODS IN A STRAIGHT LINE BY A PLANT WITH FIXED TEST HEADS |
| GB2033579B (en) * | 1978-10-05 | 1983-05-11 | Babcock Power Ltd | Ultrasonic probes |
| DE2852768C2 (en) * | 1978-12-04 | 1982-10-28 | Mannesmann AG, 4000 Düsseldorf | Ultrasonic testing system |
| US4435984A (en) * | 1980-04-21 | 1984-03-13 | Southwest Research Institute | Ultrasonic multiple-beam technique for detecting cracks in bimetallic or coarse-grained materials |
| US4523468A (en) * | 1983-10-03 | 1985-06-18 | Trw Inc. | Phased array inspection of cylindrical objects |
| JPS60235055A (en) * | 1984-05-08 | 1985-11-21 | Sumitomo Metal Ind Ltd | Ultrasonic flaw detection of deformed steel bar |
| JPS6193952A (en) * | 1984-10-04 | 1986-05-12 | Mitsubishi Electric Corp | Ultrasonic angle flaw detection method for thick-walled pipes |
| US4740146A (en) * | 1986-07-25 | 1988-04-26 | Peter Angelbeck | Apparatus for measuring and controlling the wall thickness of plastic pipes |
| US4905527A (en) * | 1988-05-25 | 1990-03-06 | The Babcock & Wilcox Company | Boiler tube wall inspection system |
| US5085082A (en) * | 1990-10-24 | 1992-02-04 | The Babcock & Wilcox Company | Apparatus and method of discriminating flaw depths in the inspection of tubular products |
| JP2501489B2 (en) * | 1991-03-20 | 1996-05-29 | 日本鋼管株式会社 | Method and apparatus for ultrasonic flaw detection of steel pipe |
| FR2682482B1 (en) * | 1991-10-14 | 1993-12-31 | Aerospatiale Ste Nationale Indle | APPARATUS FOR NON - DESTRUCTIVE ULTRASONIC TESTING OF MATERIALS SUCH AS COMPOSITE MATERIALS AND METHOD THEREOF. |
| JP2749021B2 (en) * | 1991-10-31 | 1998-05-13 | 日立電線 株式会社 | Automatic ultrasonic flaw detector |
| DE9214948U1 (en) * | 1992-11-03 | 1994-03-10 | Siemens AG, 80333 München | Ultrasonic transducer arrangement |
| US6070832A (en) * | 1994-02-08 | 2000-06-06 | The United States Of America As Represented By The Secretary Of The Air Force | Ultrasonic angular measurement system |
| US5460046A (en) | 1994-05-25 | 1995-10-24 | Tdw Delaware, Inc. | Method and apparatus for ultrasonic pipeline inspection |
| US5535628A (en) * | 1994-11-14 | 1996-07-16 | Rohrback Cosasco Systems, Inc. | Ultrasonic scanner head and method |
| DE19509290C1 (en) * | 1995-03-15 | 1996-05-02 | Bbc Reaktor Gmbh | Ultrasonic test head for coupling screw |
| US6266983B1 (en) * | 1998-12-09 | 2001-07-31 | Kawasaki Steel Corporation | Method and apparatus for detecting flaws in strip, method of manufacturing cold-rolled steel sheet and pickling equipment for hot-rolled steel strip |
-
1998
- 1998-11-13 AT AT98962383T patent/ATE260458T1/en active
- 1998-11-13 US US09/554,774 patent/US6443011B1/en not_active Expired - Fee Related
- 1998-11-13 JP JP2000521359A patent/JP3477170B2/en not_active Expired - Fee Related
- 1998-11-13 DE DE59810859T patent/DE59810859D1/en not_active Expired - Lifetime
- 1998-11-13 DE DE19852335A patent/DE19852335C2/en not_active Expired - Fee Related
- 1998-11-13 WO PCT/EP1998/007515 patent/WO1999026040A1/en active IP Right Grant
- 1998-11-13 DK DK98962383T patent/DK1032804T3/en active
- 1998-11-13 EP EP98962383A patent/EP1032804B1/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9528142B2 (en) | 2001-02-14 | 2016-12-27 | Handylab, Inc. | Heat-reduction methods and systems related to microfluidic devices |
| US10571935B2 (en) | 2001-03-28 | 2020-02-25 | Handylab, Inc. | Methods and systems for control of general purpose microfluidic devices |
| US9677121B2 (en) | 2001-03-28 | 2017-06-13 | Handylab, Inc. | Systems and methods for thermal actuation of microfluidic devices |
| US9670528B2 (en) | 2003-07-31 | 2017-06-06 | Handylab, Inc. | Processing particle-containing samples |
| US10364456B2 (en) | 2004-05-03 | 2019-07-30 | Handylab, Inc. | Method for processing polynucleotide-containing samples |
| US9802199B2 (en) | 2006-03-24 | 2017-10-31 | Handylab, Inc. | Fluorescence detector for microfluidic diagnostic system |
| US9815057B2 (en) | 2006-11-14 | 2017-11-14 | Handylab, Inc. | Microfluidic cartridge and method of making same |
| US10179910B2 (en) | 2007-07-13 | 2019-01-15 | Handylab, Inc. | Rack for sample tubes and reagent holders |
| US9618139B2 (en) | 2007-07-13 | 2017-04-11 | Handylab, Inc. | Integrated heater and magnetic separator |
| US10065185B2 (en) | 2007-07-13 | 2018-09-04 | Handylab, Inc. | Microfluidic cartridge |
| US10071376B2 (en) | 2007-07-13 | 2018-09-11 | Handylab, Inc. | Integrated apparatus for performing nucleic acid extraction and diagnostic testing on multiple biological samples |
| US10100302B2 (en) | 2007-07-13 | 2018-10-16 | Handylab, Inc. | Polynucleotide capture materials, and methods of using same |
| USD787087S1 (en) | 2008-07-14 | 2017-05-16 | Handylab, Inc. | Housing |
| US9765389B2 (en) | 2011-04-15 | 2017-09-19 | Becton, Dickinson And Company | Scanning real-time microfluidic thermocycler and methods for synchronized thermocycling and scanning optical detection |
| US9480983B2 (en) | 2011-09-30 | 2016-11-01 | Becton, Dickinson And Company | Unitized reagent strip |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1999026040A1 (en) | 1999-05-27 |
| ATE260458T1 (en) | 2004-03-15 |
| DE59810859D1 (en) | 2004-04-01 |
| JP3477170B2 (en) | 2003-12-10 |
| DE19852335C2 (en) | 2002-05-29 |
| EP1032804B1 (en) | 2004-02-25 |
| DK1032804T3 (en) | 2004-05-24 |
| EP1032804A1 (en) | 2000-09-06 |
| US6443011B1 (en) | 2002-09-03 |
| DE19852335A1 (en) | 1999-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3477170B2 (en) | Apparatus for detecting defects in continuously moving plastic strips or tubes using ultrasonic signals and / or measuring their wall thickness | |
| US5431054A (en) | Ultrasonic flaw detection device | |
| US4523468A (en) | Phased array inspection of cylindrical objects | |
| US10557831B2 (en) | Pipeline crack detection | |
| US20120191377A1 (en) | Method and device for ultrasonic testing | |
| US8117918B2 (en) | Method and apparatus for determining pipewall thickness using one or more ultrasonic sensors | |
| EP2274607B1 (en) | System for ultrasonically detecting defects in a pipe wall | |
| US9810666B2 (en) | Device and method for nondestructive inspection of tubular products, especially on site | |
| JP2005502046A (en) | Pipeline inspection device | |
| US7900517B2 (en) | System and method for inspecting a pipeline with ultrasound | |
| KR101882838B1 (en) | Peeling inspection method of laminate and peeling inspection device | |
| CN108871476A (en) | Ultrasonic flowmeter | |
| US11092572B2 (en) | Method for the nondestructive examination of a test specimen by use of ultrasound | |
| EP3489674B1 (en) | Ultrasonic inspection of a structure with a ramp | |
| JPS61133856A (en) | Method and apparatus for diagnosing underground pipeline | |
| US20230042853A1 (en) | Wall Thickness Detection of a Material Layer Using Ultrasound | |
| CA1075805A (en) | Ultrasonic testing of seams | |
| RU2042946C1 (en) | Ultrasonic device for automatic quality inspection of metal of pipe-lines | |
| US4362059A (en) | Ultrasonic testing method and apparatus | |
| JP3810661B2 (en) | Defect detection method for piping | |
| RU2818035C1 (en) | Method for ultrasonic inspection of local sections of railway rails | |
| RU2791670C1 (en) | Method for checking quality of acoustic contact between ultrasonic transducer and ceramic product during ultrasonic flaw detection | |
| JP2001324483A (en) | Evaluation method of pipe | |
| Volker et al. | 1D profiling using highly dispersive guided waves | |
| JPH0431350B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080926 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080926 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090926 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100926 Year of fee payment: 7 |
|
| LAPS | Cancellation because of no payment of annual fees |